The only person I know and can remember is Earl Boen, who plays Dr. Silberman in all three movies. Him being in T3 wasn't really needed, but was great to see him. Shame no one else returned.
Your guess is as good as mind about the camp site scene. Maybe the people who owned the R.V. went fishing or something?
I'm happy the "Sgt. Candy" scene was cut, because it had too much humour and felt weird. I don't think people wanted that scene in, did they?!? The main reason it wasn't in the movie was because it was only shot for the T3 video game.
And the date, I don't remember, OMG I'm forgetting the things I love most, sorry mum :P